[Bug 1650555] [NEW] nsswitch.conf configuration doesn't work with mdns hosts

[Alberto Donato]

Public bug reported:

On a fresh Ubuntu 16.10 (yakkety) install, resolution of mDNS hosts
doesn't work anymore (it used to in xenial)

I can resolve names with avahi-resolve but ssh,ping,etc. fail to
resolve.

After some digging I found out that what's causing it is the "resolve"
option in /etc/nsswitch.conf:

hosts:          files resolve [!UNAVAIL=return] mdns4_minimal
[NOTFOUND=return] dns

Changing it to

hosts:          files mdns4_minimal [NOTFOUND=return] dns

(as it was on xenial) makes mDNS work again.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: libnss-resolve 231-9ubuntu2
ProcVersionSignature: Ubuntu 4.8.0-30.32-generic 4.8.6
Uname: Linux 4.8.0-30-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
Date: Fri Dec 16 15:16:38 2016
InstallationDate: Installed on 2016-10-22 (54 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug yakkety

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Title:
  nsswitch.conf configuration doesn't work with mdns hosts

Status in systemd package in Ubuntu:
  New

Bug description:
  On a fresh Ubuntu 16.10 (yakkety) install, resolution of mDNS hosts
  doesn't work anymore (it used to in xenial)

  I can resolve names with avahi-resolve but ssh,ping,etc. fail to
  resolve.

  After some digging I found out that what's causing it is the "resolve"
  option in /etc/nsswitch.conf:

  hosts:          files resolve [!UNAVAIL=return] mdns4_minimal
  [NOTFOUND=return] dns

  Changing it to

  hosts:          files mdns4_minimal [NOTFOUND=return] dns

  (as it was on xenial) makes mDNS work again.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: libnss-resolve 231-9ubuntu2
  ProcVersionSignature: Ubuntu 4.8.0-30.32-generic 4.8.6
  Uname: Linux 4.8.0-30-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  Date: Fri Dec 16 15:16:38 2016
  InstallationDate: Installed on 2016-10-22 (54 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)

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